- EMDB-51157: Cryo-EM structure of the Toxoplasma gondii respiratory chain comp... -
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基本情報
登録情報
データベース: EMDB / ID: EMD-51157
タイトル
Cryo-EM structure of the Toxoplasma gondii respiratory chain complex III inhibited by ELQ-300
マップデータ
試料
複合体: Cytochrome bc1 complex from Toxoplasma gondii
タンパク質・ペプチド: x 12種
リガンド: x 8種
キーワード
cytochrome bc1 complex / complex III / respiratory chain / ELECTRON TRANSPORT
機能・相同性
機能・相同性情報
quinol-cytochrome-c reductase / mitochondrial processing peptidase / respiratory chain complex III / quinol-cytochrome-c reductase activity / mitochondrial electron transport, ubiquinol to cytochrome c / metalloendopeptidase activity / 2 iron, 2 sulfur cluster binding / electron transfer activity / mitochondrial inner membrane / heme binding ...quinol-cytochrome-c reductase / mitochondrial processing peptidase / respiratory chain complex III / quinol-cytochrome-c reductase activity / mitochondrial electron transport, ubiquinol to cytochrome c / metalloendopeptidase activity / 2 iron, 2 sulfur cluster binding / electron transfer activity / mitochondrial inner membrane / heme binding / mitochondrion / proteolysis / metal ion binding / membrane 類似検索 - 分子機能
Cytochrome b-c1 complex, subunit 6 / Cytochrome b-c1 complex subunit 7 / Cytochrome b-c1 complex subunit 7 superfamily / Ubiquinol-cytochrome C reductase complex 14kD subunit / Cytochrome b-c1 complex subunit 8 superfamily / Ubiquinol-cytochrome C reductase hinge domain / Ubiquinol-cytochrome C reductase hinge domain superfamily / Ubiquinol-cytochrome C reductase hinge protein / Cytochrome b-c1 complex subunit 9 / Cytochrome b-c1 complex subunit 9 superfamily ...Cytochrome b-c1 complex, subunit 6 / Cytochrome b-c1 complex subunit 7 / Cytochrome b-c1 complex subunit 7 superfamily / Ubiquinol-cytochrome C reductase complex 14kD subunit / Cytochrome b-c1 complex subunit 8 superfamily / Ubiquinol-cytochrome C reductase hinge domain / Ubiquinol-cytochrome C reductase hinge domain superfamily / Ubiquinol-cytochrome C reductase hinge protein / Cytochrome b-c1 complex subunit 9 / Cytochrome b-c1 complex subunit 9 superfamily / Ubiquinol-cytochrome C reductase, UQCRX/QCR9 like / Cytochrome c1, transmembrane anchor, C-terminal / : / Ubiquinol-cytochrome c reductase, iron-sulphur subunit / Cytochrome c1 / Cytochrome C1 family / : / Cytochrome b/b6, C-terminal / Cytochrome b(C-terminal)/b6/petD / Cytochrome b/b6 C-terminal region profile. / Peptidase M16, zinc-binding site / Insulinase family, zinc-binding region signature. / Cytochrome b/b6, C-terminal domain superfamily / Cytochrome b/b6/petB / Rieske iron-sulphur protein, C-terminal / Cytochrome b/b6, N-terminal / Cytochrome b/b6-like domain superfamily / Cytochrome b/b6 N-terminal region profile. / Di-haem cytochrome, transmembrane / Rieske iron-sulphur protein / Peptidase M16, C-terminal / Peptidase M16 inactive domain / Peptidase M16, N-terminal / Insulinase (Peptidase family M16) / Metalloenzyme, LuxS/M16 peptidase-like / Rieske [2Fe-2S] domain / Rieske [2Fe-2S] iron-sulphur domain / Rieske [2Fe-2S] iron-sulfur domain profile. / Rieske [2Fe-2S] iron-sulphur domain superfamily / Cytochrome c family profile. / Cytochrome c-like domain / Cytochrome c-like domain superfamily 類似検索 - ドメイン・相同性
Putative peptidase M16, alpha subunit / Uncharacterized protein / Ubiquinol-cytochrome c reductase / Transmembrane protein / Cytochrome b / Putative ubiquinol cytochrome c oxidoreductase / Transmembrane protein / Transmembrane protein / Ubiquinol-cytochrome C family reductase UQCRX/QCR9-like protein / Putative ubiquinol-cytochrome c reductase hinge protein ...Putative peptidase M16, alpha subunit / Uncharacterized protein / Ubiquinol-cytochrome c reductase / Transmembrane protein / Cytochrome b / Putative ubiquinol cytochrome c oxidoreductase / Transmembrane protein / Transmembrane protein / Ubiquinol-cytochrome C family reductase UQCRX/QCR9-like protein / Putative ubiquinol-cytochrome c reductase hinge protein / Putative peptidase M16 family potein / Cytochrome c1, heme protein 類似検索 - 構成要素
ジャーナル: Nat Struct Mol Biol / 年: 2025 タイトル: Structure, assembly and inhibition of the Toxoplasma gondii respiratory chain supercomplex. 著者: Andrew E MacLean / Shikha Shikha / Mariana Ferreira Silva / Max J Gramelspacher / Aaron Nilsen / Katherine M Liebman / Sovitj Pou / Rolf W Winter / Amit Meir / Michael K Riscoe / J Stone ...著者: Andrew E MacLean / Shikha Shikha / Mariana Ferreira Silva / Max J Gramelspacher / Aaron Nilsen / Katherine M Liebman / Sovitj Pou / Rolf W Winter / Amit Meir / Michael K Riscoe / J Stone Doggett / Lilach Sheiner / Alexander Mühleip / 要旨: The apicomplexan mitochondrial electron transport chain is essential for parasite survival and displays a divergent subunit composition. Here we report cryo-electron microscopy structures of an ...The apicomplexan mitochondrial electron transport chain is essential for parasite survival and displays a divergent subunit composition. Here we report cryo-electron microscopy structures of an apicomplexan III-IV supercomplex and of the drug target complex III. The supercomplex structure reveals how clade-specific subunits form an apicomplexan-conserved III-IV interface with a unique, kinked architecture, suggesting that supercomplexes evolved independently in different eukaryotic lineages. A knockout resulting in supercomplex disassembly challenges the proposed role of III-IV in electron transfer efficiency as suggested for mammals. Nevertheless, knockout analysis indicates that III-IV is critical for parasite fitness. The complexes from the model parasite Toxoplasma gondii were inhibited with the antimalarial atovaquone, revealing interactions underpinning species specificity. They were also inhibited with endochin-like quinolone (ELQ)-300, an inhibitor in late-stage preclinical development. Notably, in the apicomplexan binding site, ELQ-300 is flipped compared with related compounds in the mammalian enzyme. On the basis of the binding modes and parasite-specific interactions discovered, we designed more potent ELQs with subnanomolar activity against T. gondii. Our findings reveal critical evolutionary differences in the role of supercomplexes in mitochondrial biology and provide insight into cytochrome b inhibition, informing future drug discovery.